jim bolden, cnn, london. >> amazing. let's dig in a little deeper with physicist and cosmologist lawrence krauss. he's made a career of explaining for people like me and you everything from how the tiniest particles behave to how the universe will end. he is the director of the origins project at arizona state university and his latest book is called "a universe from nothing." we spoke earlier tonight. professor, thank you for joining us. our first question is how was this meteor able to do so much damage? >> well, it's a 10 ton or 20 ton sized object going 30,000 miles per hour. suddenly stopping in the atmosphere. you can imagine it's a lot worse than getting hit by a truck. >> i mean, i don't really understand how it works. tell me, what is it about this flying piece of space matter that makes such damage when it comes in? you say the speed and i guess temperature, but it really blew out windows so far away. people falling down. even though it was big, how did it do so much damage? >> well, you know, when a space shut